If your answer lives in your head or a half-finished spreadsheet, it's already out of date
Stellar Pokemon, on the evidence of the current card weve seen (thanks to Justin Basil for the translation) have the same look and mechanics that Tera Pokemon ex do, which is to say that they have a very crystallised look to the Pokemon themselves, as well as a passive ability that stops them from being damaged when theyre on the Bench (and, therefore, not Active)
Pokmon BREAK provides increased HP and additional moves to their matching Pokmon - similar to Lv.X and EX cards, but without the downside of your opponent drawing an extra prize card when knocked out
For everyone else, however, this drop isnt nearly as exciting
This attack does 30 more damage for each damage counter on your opponents Active Pokemon